<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-02 -033 17:40:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.02.02 (033) 17:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202603302021740009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.467" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.908" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.250" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="405.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="405.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="540.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.134" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.240" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="376.435" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="269.498" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.365" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.350" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="132.280" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.529" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="74.428" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="198.250" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="6.650" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="78">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
405.000 410.000 413.333 416.667 420.000 420.833 421.667 422.500 423.333 424.167 425.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 445.000 450.000 450.000 450.000 451.667 453.333 455.000 455.000 460.000 465.000 470.000 470.000 470.000 475.000 480.000 480.000 485.000 485.000 490.000 490.000 490.000 490.000 490.000 495.000 500.000 505.000 505.000 505.000 505.000 505.000 505.000 510.000 510.000 510.000 510.000 515.000 515.000 515.000 520.000 520.000 520.000 520.000 525.000 530.000 535.000 535.000 540.000 540.000 540.000 545.000 549.005 553.578 558.850 564.992 572.240 580.922 591.512
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 0 45 0 48 0 0 0 51 57 60 60 63 66 60 57 66 60 51 60 57 60 57 0 0 57 54 57 0 51 57 0 54 57 57 54 60 48 54 60 54 48 63 0 57 60 0 54 60 54 51 60 60 57 66 0 57 57 57 60 48 0 54 45 54 45 51 48 51 54 54 54 54 48 51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -2.734375 -2.734375 1.953125 0.390625 -0.390625 2.734375 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="79">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 117.500 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 119.000 118.000 117.000 116.000 115.000 120.000 118.333 116.667 115.000 120.000 118.750 117.500 116.250 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 113.333 111.667 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 0 0 48 45 0 0 0 0 0 0 0 48 45 51 0 51 48 51 0 0 54 48 0 48 0 57 48 0 0 45 0 0 0 0 51 51 45 0 0 0 0 60 51 0 0 54 48 0 0 0 57 60 0 57 60 57 60 57 0 0 60 0 60 0 51 51 54 60 60 54 0 57 51 54 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 2.734375 -1.953125 -0.390625 0.390625 -0.390625 0.390625 0.390625 1.171875 -1.953125 -0.390625 -2.734375 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -2.734375 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.524 90.0 95.0 100.0 105.0 110.0 112.627 115.0 115.254 117.881 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 376.435 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.107 2.712 3.032 3.134 3.012 3.012 3.012 3.134 3.201 3.367 3.541 3.716 3.89 4.059 4.224 4.383 4.537 4.686 4.832 4.974 5.114 5.25 5.385 5.517 5.648 5.778 5.907 6.035 6.162 6.289 6.415 6.542 6.668 6.795 6.922 7.05 7.178 7.308 7.438 7.569 7.701 7.835 7.971 8.108 8.247 8.389 8.533 8.679 8.828 8.98 9.136 9.295 9.458 9.624 9.793 9.964 10.134 10.293 10.425 10.496 10.5 10.498 10.487 10.467 10.44 10.404 10.361 10.311 10.255 10.192 10.124 10.05 9.971 9.888 9.8 9.708 9.612 9.513 9.411 9.306 9.198 9.088 8.977 8.863 8.748 8.631 8.514 8.396 8.276 8.157 8.037 7.916 7.796 7.675 7.555 7.435 7.316 7.197 7.078 6.96 6.843 6.727 6.612 6.498 6.385 6.273 6.162 6.052 5.943 5.836 5.73 5.625 5.522 5.42 5.319 5.22 5.122 5.026 4.931 4.837 4.745 4.654 4.565 4.477 4.39 4.305 4.221 4.139 4.058 3.979 3.9 3.824 3.748 3.674 3.601 3.53 3.459 3.39 3.323 3.256 3.191 3.127 3.064 3.002 2.942 2.883 2.824 2.767 2.711 2.656 2.602 2.55 2.498 2.447 2.397 2.348 2.3 2.253 2.207 2.162 2.118 2.075 2.032 1.99 1.95 1.91 1.87 1.832 1.794 1.758 1.721 1.686 1.651 1.617 1.584 1.551 1.519 1.488 1.457 1.427 1.398 1.369 1.341 1.313 1.286 1.259

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.134" PeakHeight="110.0" Num="3" Error="0.0">
-30.305 12.864 -3.035
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.134" EndFrequency="10.5" PeakHeight="376.435" Num="5" zHalfNm="269.498" Error="2.686">
-206.25 -83.545 37.627 -5.541 -0.845
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.881" Depth="0.122"/>
<TopsideChapman PeakHeight="376.435" PeakDensity="1367866.0" PeakScaleHeight="74.428" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
